SQLServer: fix obscure optimistic locking bug, support uniqueidentifier...

SQLServer: fix obscure optimistic locking bug, support uniqueidentifier columns, cope with tables names qualified by owner, cope with columns with desc in the name, cope with primary keys with select in the name.  Closes #3068, #2930, #3067, #1950, #3057, #3162.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3270 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* SQLServer: fix obscure optimistic locking bug.  #3068 [kajism@yahoo.com]
+
+* SQLServer: support uniqueidentifier columns.  #2930 [keithm@infused.org]
+
+* SQLServer: cope with tables names qualified by owner.  #3067 [jeff@ministrycentered.com]
+
+* SQLServer: cope with columns with "desc" in the name.  #1950 [Ron Lusk, Ryan Tomayko]
+
+* SQLServer: cope with primary keys with "select" in the name.  #3057 [rdifrango@captechventures.com]
+
 * Oracle: active? performs a select instead of a commit.  #3133 [Michael Schoen]
 
 * MySQL: more robust test for nullified result hashes.  #3124 [Stefan Kaes]

activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -68,6 +68,7 @@ def simplified_type(field_type)
           when /binary|image|varbinary/i                             then :binary
           when /char|nchar|nvarchar|string|varchar/i                 then :string
           when /bit/i                                                then :boolean
+          when /uniqueidentifier/i                                   then :string
         end
       end
 
@@ -233,6 +234,9 @@ def select_one(sql, name = nil)
       end
 
       def columns(table_name, name = nil)
+        return [] if table_name.blank?
+        table_name = table_name.to_s if table_name.is_a?(Symbol)
+        table_name = table_name.split('.')[-1] unless table_name.nil?
         sql = "SELECT COLUMN_NAME as ColName, COLUMN_DEFAULT as DefaultValue, DATA_TYPE as ColType, COL_LENGTH('#{table_name}', COLUMN_NAME) as Length, COLUMNPROPERTY(OBJECT_ID('#{table_name}'), COLUMN_NAME, 'IsIdentity') as IsIdentity, NUMERIC_SCALE as Scale FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '#{table_name}'"
         # Comment out if you want to have the Columns select statment logged.
         # Personnally, I think it adds unneccessary bloat to the log. 
@@ -347,7 +351,7 @@ def quote_column_name(name)
 
       def add_limit_offset!(sql, options)
         if options[:limit] and options[:offset]
-          total_rows = @connection.select_all("SELECT count(*) as TotalRows from (#{sql.gsub(/SELECT/i, "SELECT TOP 1000000000")}) tally")[0][:TotalRows].to_i
+          total_rows = @connection.select_all("SELECT count(*) as TotalRows from (#{sql.gsub(/\bSELECT\b/i, "SELECT TOP 1000000000")}) tally")[0][:TotalRows].to_i
           if (options[:limit] + options[:offset]) >= total_rows
             options[:limit] = (total_rows - options[:offset] >= 0) ? (total_rows - options[:offset]) : 0
           end
@@ -509,9 +513,9 @@ def query_contains_identity_column(sql, col)
 
         def change_order_direction(order)
           case order
-            when  /DESC/i     then order.gsub(/DESC/i, "ASC")
-            when  /ASC/i      then order.gsub(/ASC/i, "DESC")
-            else                   String.new(order).split(',').join(' DESC,') + ' DESC'
+            when  /\bDESC\b/i     then order.gsub(/\bDESC\b/i, "ASC")
+            when  /\bASC\b/i      then order.gsub(/\bASC\b/i, "DESC")
+            else                  String.new(order).split(',').join(' DESC,') + ' DESC'
           end
         end